This is why I think they will go to a diesel electric system on big trucks, to keep the engine running at a more constant rpm.
Another drawback of D.P.Filter is it makes the truck quiet and that is also unacceptable to some of us.
I agree with you, as many prototypes of heavy duty trucks with a diesel electric system as you describe are already being tested. That is how freight trains have operated for a long time.
Yeah, the diesel sound is gradually disappearing, along with the plumes of black smoke. My neighbor bought a relatively new Ford F250 with the latest new Ford designed diesel engine, and I thought at first it was a gasoline truck until I got a lot closer. Most people would not know it is a diesel.